hey guys i was on summit just lookin around and i noticed they have a 302/312 duration cam.. would this be too heavy for stock valves, head, this kit comes with a set of lifters for it too, all for $79.95 i was wondering if this cam is of bad quality.. i came from a 4.6 mustang where my cams were almost $1000. They list them as summit's cams. My real question is what kind of springs would i use for something like that and if anything would fail with a completely stock engine?? thanks guys